Li Xuechi, Xu Lizhong, Liang Cui, Xu Beibei, Zhou Yilan, Miao Lijun, Zhang Dengwei
Opt Lett. 2023 Aug 1;48(15):3897-3900. doi: 10.1364/OL.493587.
The bandwidth is one of the key indicators of the interferometric fiber optic gyroscope (I-FOG) in the application with high frequency jitter. The traditional bandwidth measurement equipment, such as the angular vibration table, can only provide angular vibrations of hundreds of hertz and cannot meet the measurement needs of a high bandwidth gyro. We propose an approach, with which a signal of several thousand hertz can be provided and can measure a high bandwidth of I-FOGs. The bandwidth measurement approach is based on the axial magnetic sensitivity. We present the measurement principle, derive the axial magnetic sensitivity expression of the fiber coil in I-FOGs, and demonstrate the bandwidth measuring system. With this system, the bandwidth of an I-FOG is measured and the experimental result shows that the bandwidth is ∼10 kHz. It is proved that this new, to the best of our knowledge, approach is capable of testing the bandwidth of the I-FOG at ultrahigh frequencies.
带宽是干涉式光纤陀螺仪（I-FOG）在高频抖动应用中的关键指标之一。传统的带宽测量设备，如角振动台，只能提供数百赫兹的角振动，无法满足高带宽陀螺仪的测量需求。我们提出了一种方法，该方法可以提供数千赫兹的信号，并能够测量I-FOG的高带宽。带宽测量方法基于轴向磁灵敏度。我们介绍了测量原理，推导了I-FOG中光纤线圈的轴向磁灵敏度表达式，并展示了带宽测量系统。利用该系统测量了I-FOG的带宽，实验结果表明带宽约为10kHz。据我们所知，证明了这种新方法能够在超高频下测试I-FOG的带宽。
